Transparency window for the absorptive dipole resonance in a symmetry-reduced grating structure

Zheng Gao Dong, Pei Gen Ni, Jie Zhu, X. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


We demonstrate that a transparency window can be obtained within the absorptive dipole resonant regime, by slightly reducing the symmetric arrangement of a dipole-like bar grating covered by a waveguiding layer. The physical understanding is that, under the condition of reducing the grating symmetry, the lossy dipole plasmon resonance can be completely transferred into the waveguide mode in a way of destructive interference. In accompany with the tunable transparency window modulated by the symmetry-reduced displacement, an ultra high group index (slowing down the light) as well as a vortex distribution of the electromagnetic field is found.
Original languageEnglish
Pages (from-to)7206-7211
Number of pages6
JournalOptics Express
Issue number7
Publication statusPublished - 26 Mar 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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